DAYTONA BEACH, Fla. (AP) - Authorities say a Florida couple was found dead near their still-running car with their three young children in the backseat died of an accidental Fentanyl overdose.

The Volusia County medical examiner released its report Friday into the deaths of 32-year-old Daniel and Heather Kelsey, 30.

The two were found on the side of Interstate 4 in December. Authorities say the couple's three boys, ages 2, 1 and an infant, were inside and strapped into car seats watching a movie.

The Volusia County Sheriff's Office says the autopsies showed no foul play or signs of trauma in the two deaths.

The Daytona Beach News-Journal reports ( 27 fatal Fentanyl overdoses in Volusia County last year, four times more than in 2014.